django - 原子事务不起作用 django rest

Question

我正在使用 DRF、基于 API View 类的 View 、post 方法。参数是:文件逻辑:对文件进行一些验证并逐步保存文件(不同类型的对象)如果在保存文件的其余部分时发生异常，我将尝试回滚事务。我设置了 'ATOMIC_REQUESTS': True

class SaveXMlFile(APIView):
   authentication_classes = [TokenAuthentication]
   permission_classes = [IsAuthenticated]
   parser_classes = [FormParser, MultiPartParser]

   def post(self, request):
      """
          Save xml file
          ---
          # inputs
          parameters:
              - name: game_log_file
                description: Game log file
                type: file
                required: true
                paramType: post
                allowMultiple: false
      """
      try:
          # import pdb; pdb.set_trace()
          game_log_file = request.data['game_log_file']
          file_store = FileStore.objects.create(uploaded_file=game_log_file)
          xml_file_processing = ProcessXmlFile(file_store)
          already_saved = xml_file_processing.was_file_saved()
          player_exists = xml_file_processing.player_exists()
          if already_saved:
              file_store.delete()
              return Response({"info": "File was saved previously, no action taken place this time."}, status=200)
          if not player_exists:
              file_store.delete()
              return Response({"info":  "No player exists in the database, ask your administrator to create some."}, status=200)
          xml_file_processing.save()
          file_store.delete()
          return Response({"success": "File has been saved."}, status=status.HTTP_201_CREATED)
      except Exception as err:
          error = "{0}".format(str(err))
          return JsonResponse({'exception': error}, status=500)

我故意在文件已保存一半时抛出异常，但提交的事务不会回滚，即使在此过程中引发异常也是如此。

如有任何想法，我们将不胜感激。

Answer 1

您应该阅读更多有关事务如何与 Django 一起工作的内容。由于您正在捕获异常，无论您的响应代码是什么，Django 都会看到一切正常并提交事务。取自https://docs.djangoproject.com/en/1.10/topics/db/transactions/#tying-transactions-to-http-requests :

It works like this. Before calling a view function, Django starts a transaction. If the response is produced without problems, Django commits the transaction. If the view produces an exception, Django rolls back the transaction.

因此，由于您正在捕获异常并返回响应，Django 认为没有理由执行回滚。